LLC resonant converter and electronic device

Abstract

An LLC resonant converter and an electronic device are provided. The LLC resonant converter according to the present disclosure includes a multi input transformer, first and second converter units connected to a primary side of the multi input transformer, an input voltage part, a first balance capacitor, and an output part connected to a secondary side of the multi input transformer.

What is claimed is: 
     
       1. An LLC resonant converter comprising:
 a multi input transformer; 
 first and second converter units configured to be connected to a primary side of the multi input transformer; 
 an input voltage part configured to apply a voltage to both ends at which the first and second converter units are connected in series with each other; 
 a first balance capacitor configured to maintain a voltage between the first and second converter units to be consistent; and 
 an output part configured to be connected to a secondary side of the multi input transformer, 
 wherein the first converter unit includes a first part in which a first switch and a first resonance capacitor are connected in series with each other and a second part in which a second switch and a second resonance capacitor are connected in series with each other, 
 the first part, the second part, and a primary side winding of the transformer are connected in parallel to each other, the first switch and the second switch are connected to each other, and the first resonance capacitor and the second resonance capacitor are connected to each other, 
 the second converter unit includes a third part in which a third switch and a third resonance capacitor are connected in series with each other and a fourth part in which a fourth switch and a fourth resonance capacitor are connected in series with each other, 
 the third part, the fourth part, and a secondary side winding of the transformer are connected in parallel to each other, the third switch and the fourth switch are connected to each other, and the third resonance capacitor and the fourth resonance capacitor are connected to each other, and 
 the first balance capacitor is connected to a node between the first switch and the second switch and a node between the third switch and the fourth switch, 
 wherein the voltage applied to the first converter unit is equal to a voltage charged in the first balance capacitor when the first switch and the third switch are turned on, and 
 the voltage applied to the second converter unit is equal to the voltage charged in the first balance capacitor when the second switch and the fourth switch are turned on, 
 further comprising a third converter unit and a second balance capacitor, 
 wherein the third converter unit includes a fifth part in which a fifth switch and a fifth resonance capacitor are connected in series with each other and a sixth part in which a sixth switch and a sixth resonance capacitor are connected in series with each other, 
 the fifth part, the sixth part, and a third input side winding of the transformer are connected in parallel to each other, the fifth switch and the sixth switch are connected to each other, and the fifth resonance capacitor and the sixth resonance capacitor are connected to each other, and 
 the second balance capacitor has one end connected to a node between the third switch and the fourth switch and a node between the fifth switch and the sixth switch, and the other end connected to one end of the first balance capacitor. 
 
     
     
       2. The LLC resonant converter as claimed in  claim 1 , wherein the first balance capacitor has capacitance greater than the first to fourth resonance capacitors. 
     
     
       3. The LLC resonant converter as claimed in  claim 2 , wherein the first and second resonance capacitors have the same capacitance, and
 the third and fourth resonance capacitors have the same capacitance. 
 
     
     
       4. The LLC resonant converter as claimed in  claim 1 , wherein primary coils of the multi input transformer connected to the first and second converter units are wound around the same core as a secondary coil of the multi input transformer. 
     
     
       5. The LLC resonant converter as claimed in  claim 1 , wherein primary coils of the multi input transformer connected to the first and second converter units have the same number of turns. 
     
     
       6. The LLC resonant converter as claimed in  claim 1 , wherein the first balance capacitor and the second balance capacitor have the same capacitance. 
     
     
       7. The LLC resonant converter as claimed in  claim 1 , wherein the first and second balance capacitors have capacitance greater than the first resonance capacitor to the sixth resonance capacitor. 
     
     
       8. The LLC resonant converter as claimed in  claim 1 , wherein the voltage applied to the first converter unit is equal to a voltage charged in the first balance capacitor when the first switch, the third switch, and the fifth switch are turned on, the voltage applied to the second converter unit is equal to a voltage charged in the second balance capacitor when the first switch, the third switch, and the fifth switch are turned on, and is equal to the voltage charged in the first balance capacitor when the second switch, the fourth switch, and the sixth switch are turned on, the voltage applied to the third converter unit is equal to the voltage charged in the second balance capacitor when the second switch, the fourth switch, and the sixth switch are turned on, and the voltages charged in the first balance capacitor and the second balance capacitor, respectively, are equal to each other. 
     
     
       9. An electronic device comprising:
 an LLC resonant converter; and 
 a processor configured to control the LLC resonant converter, 
 wherein the LLC resonant converter includes 
 a multi input transformer; 
 first and second converter units configured to be connected to a primary side of the multi input transformer; 
 an input voltage part configured to apply a voltage to both ends at which the plurality of converter units are connected in series with each other; 
 a first balance capacitor configured to maintain a voltage between the plurality of converter units to be consistent; and 
 an output part configured to be connected to a secondary side of the multi input transformer, 
 the first converter unit includes a first part in which a first switch and a first resonance capacitor are connected in series with each other and a second part in which a second switch and a second resonance capacitor are connected in series with each other, 
 the first part, the second part, and a primary side winding of the transformer are connected in parallel to each other, the first switch and the second switch are connected to each other, and the first resonance capacitor and the second resonance capacitor are connected to each other, 
 the second converter unit includes a third part in which a third switch and a third resonance capacitor are connected in series with each other and a fourth part in which a fourth switch and a fourth resonance capacitor are connected in series with each other, 
 the third part, the fourth part, and a secondary side winding of the transformer are connected in parallel to each other, the third switch and the fourth switch are connected to each other, and the third resonance capacitor and the fourth resonance capacitor are connected to each other, 
 the first balance capacitor is connected to a node between the first switch and the second switch and a node between the third switch and the fourth switch, and 
 the processor controls the first switch and the third switch to be turned on simultaneously and the second switch and the fourth switch to be turned on simultaneously, 
 wherein the voltage applied to the first converter unit is equal to a voltage charged in the first balance capacitor when the first switch and the third switch are turned on, and 
 the voltage applied to the second converter unit is equal to the voltage charged in the first balance capacitor when the second switch and the fourth switch are turned on, 
 further comprising a third converter unit and a second balance capacitor, 
 wherein the third converter unit includes a fifth part in which a fifth switch and a fifth resonance capacitor are connected in series with each other and a sixth part in which a sixth switch and a sixth resonance capacitor are connected in series with each other, 
 the fifth part, the sixth part, and a third input side winding of the transformer are connected in parallel to each other, the fifth switch and the sixth switch are connected to each other, and the fifth resonance capacitor and the sixth resonance capacitor are connected to each other, and 
 the second balance capacitor has one end connected to a node between the third switch and the fourth switch and a node between the fifth switch and the sixth switch, and the other end connected to one end of the first balance capacitor.